That would be... 5
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Because 3 is the largest number that divides into both 12 and 15 evenly with no remainder.
It is 5.
Well, isn't that a happy little math question! When we're looking at what goes into 8 and 15, we want to find the largest number that divides evenly into both. In this case, the number 1 is the only whole number that goes into both 8 and 15. Just remember, there are no mistakes in math, only happy little accidents!
The number in common is 5, because it divides both 5 and 15.
15 is a whole number.